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电子爱好者常常要判断电源的极性、电路中两点电位的高低,及电流是交流还是直流等。使用万用表判别,经常换挡,对万用表不利,有的甚至表针打弯或表头被烧坏等。本文介绍两种极性测试笔,它可以帮你排忧解难。当被测电源的极性跟测试笔极性一致时,测试笔发出绿光,告诉你“通过”。反之,则发出红光。当测到的是矩形的脉冲时(或交流电),便会绿、红交替闪
Electronic enthusiasts often have to determine the polarity of the power supply, the level of two potential in the circuit, and the current is AC or DC. Discrimination using the multimeter, often shift, detrimental to the multimeter, and some even stitches or table header is burned and so on. This article describes two kinds of polarity test pen, it can help you solve problems. When the polarity of the power supply under test with the polarity of the test pen, the test pen glow green, telling you “through ”. On the contrary, it emits red light. When measured is a rectangular pulse (or AC), it will be green, red alternately flash